No, I haven't received any messages, nor have I had any problem with pop-ups. The only problem I detect is when I try to use my browser's 'back' button to go to a previously viewed page. The only way I can do that is to use the drop down menu and scroll past that url. Of course, I'm also wary of any spyware problems.
My computer takes a long time to go through the reboot process (~15 minutes), so I am suspicious of the ad.yield.manager, but don't know if there is a cause and effect relationship.